package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;
import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            log.info("查询到的员工信息为空，返回错误信息");
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());//对页面传递过来的明文进行加密
        if (!password.equals(employee.getPassword())) {
            //密码错误
            log.info("密码比对错误");
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        //校验员工状态
        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            log.info("登录账号 {} 被禁用，禁止登录 ",employeeLoginDTO.getUsername());
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }


    /**
     * 新增员工
     * @param employeeDTO
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {

        Employee employee = new Employee();

        // 先检查用户名是否已经存在
        Employee existingEmployee = employeeMapper.getByUsername(employeeDTO.getUsername());
        if (existingEmployee != null) {
            // 如果用户名已存在，抛出异常
            throw new RuntimeException("用户名已存在: " + employeeDTO.getUsername());
        }

        //对象属性拷贝 前提属性名必须一致
        BeanUtils.copyProperties(employeeDTO,employee);

        //设置对象状态 默认正常状态 1表示正常 0 锁定
        employee.setStatus(StatusConstant.ENABLE);

        //设置密码，默认123456
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

//        //设置当前记录的创建时间和修改时间
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());
//
//        //设置当前记录创建人id和修改人id
//        //TODO 后期需要改为当前登录用户的id
//        employee.setCreateUser(BaseContext.getCurrentId());
//        employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.insert(employee);
    }

    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        // 开始分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());

        // 调用 Mapper 方法进行查询
        List<Employee> records = employeeMapper.pageQuery(employeePageQueryDTO);

        // 获取分页结果
        Page<Employee> page = (Page<Employee>) records;

        long total = page.getTotal();
        List<Employee> recordsWithPage = page.getResult();
        return new PageResult(total, recordsWithPage);
    }

    /**
     * 启用禁用员工账号
     */

    @Override
    public void startOrStop(Integer status, long id) {
        //update employee set status = ? where id = ?

//        Employee employee = new Employee();
//        employee.setStatus(status);
//        employee.setId(id);
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();
        employeeMapper.update(employee);
    }

    /**
     * 根据id查询员工
     * @param id
     * @return
     */
    @Override
    public Employee getById(Long id) {
        Employee employee = employeeMapper.getById(id);
        employee.setPassword("****");
        return employee;
    }

    /**
     * 编辑员工信息
     * @param employeeDTO
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);

//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.update(employee);
    }


}
